Shaft packing



Aug. 21, 1928. 1,681,444

E. w. STEVENS SHAFT PACKING Original Filed March 1 1925 INVENTOR.

. Edward. W. Sfevens A TTORNEY.

Patented Aug. 21, 1928.

UNITED sures- PATENT OFFICE.

EDWARD W. STEVENS, OF

TOOL COIPANY, OF NEW smr racxma.

Original application filed larch 11, 1925, eel-s l ne.

16,095. Divided and this ap lication filed larch 19, i

1926. Serial I'o. 95,842.

The resent invention relates to packin'gs genera y, and more particularly to improved packings for reciprocating stems, rods and shafts. This application 15 a division of my copending application, Serial'No. 16,095 filed March 17, 1925.

Among the objects of the invention areto facilitate the handling and insertion of packings, to provide a new form of molded packing and protective container or package therefor, and in general to improve prior forms and methods.

In order to illustrate the invention and the manner of its use one concrete embodiment thereof is shown in'the accompanying drawings in which:

Fig. 1 is a longitudinal sectlonal view through the forward 'end of the cylinder of a pneumatic sand rammer; p

Fig. 2 is a right end elevation of the part shown in Fig 1. p

Fig. 3 is a view similar to Fig. 1 on a reduced scale showing the manner of inserting a new packing, and

Fig. 4 is a perspective view of the molded packing in its container.

The embodiment of the invention chosen for the purpose of illustration is shown in the drawings as sealing the forward end of the piston chamber of a pneumatic sand rammer comprising the cylinder or. barrel 5 in which iston 6 reciprocates, the latter having attached thereto or integral therewith a stem 6 which projects beyond the cylinder 5 and carries the butt or pein (not shown). The motive fluid admitted to the front end of the piston chamber throughpassage 7 to drive piston 6 on its back stroke'is sealed against escape through the forward open end of the cylinder by the following constructlon. A packing gland member 8 in the form of a hollow cylinder or sleeve is rigidly secured within the open end of the cylinder as shown. One method of rigidly securing member 8 in the cylinder is to'provide the latter with internal screw threads 5 and themember with external screw threads 8 Opposite slots as 8 a for use.

permit the use of aspanner wrench for inserting member ing with asimilar shoulder within cylinder 5 serves as 'a stop. .The cylinder bore 9 of member 9 receives stem 6 with asliding fit and serves as a bearing for the latter. Memher 8 is provided with counter bore 9 in which 8* and a shoulder 8 cooperate packingv material 10 is seated surrounding steln'ti and a. second gland member ll in the form of a cylinder sleeved over stem 6 makes a close sliding lit with count crborc S) and telc scopes'within member Sto place packing 10 under compression.- Member 11 is of substantial length as indicated and projects beyond cylinder 5. -A gland nut 12 having'a head 12* with a bore 12 loosely receiving stem 6 is provided with a cylindrical extcn- I sion 12: arranged loosclyto telescope over the pro ect1ng portion of member 11 and is exterlorly threaded for engagement with the nterior threads 5 of cylinder 5. Head 12 is formed with a rim extending beyond cylind er portion 12 and interposed between this 11111 and the end of the cylinder 5 and sur rounding pro3ection 12 is a coiled spring 13' whose ends l3 and 13 are removably seated 1n sockets 5" and 12 respectively in cylinder 5 and nut head 12 to hold the manually adjustable nut 12 in adjusted possition.

Fig. 4 illustrates the manner in which packmg material 10 is arranged for insertion in the above recited gland. As indicated the material is molded to the proper size and shape and enclosed in a cylindrical holder, container or envelope 14 of any suitable materlal, such as cardboard. The manner of insertlng the packin is clearly indicated in Fig. 3. With gland member 8 in position as shown the molded packing 10 in its container as a unit is sleeved over the piston stem 6 until the container 14 abuts the outer end of member 8. Gland member llis then sleeved over the stem 6 and is telescoped within the container 14 forcing the molded packing 10 into the counter-bore 9 of gland member 8, the member 11 being forced through packing 10 and into. telescoping engagement with member 8 until the parts reach the position shown in Fig. 1, the packing then being seated in'its recess. The container or envelope 14 is now removed from the stem fi and the gland nut 12 with its locking spring is aplied and set up to put packing 10 under the esired compression. The tool is then ready From the aboveit will be apparent that the present invention provides an improved package for merchandising molded packings and for protecting the same at all times. In its package the acking'is maintained in shape until actua y placed in the packing recess; in fact the packing is not removed from its container until it is forced therefrom directly into the packing recess, the container thus acting as a guide to facilitate the accurate insertion of the packing.

\Vhile the preferred form of the invention has been herein shown and described the invention is not limited to the specific details thereof but covers all changes, modifications and adaptations within the scope of the appended claims.

I claim as my invention:

1. A packing for reciprocating stems, rods and shafts, comprising packing material molded into the required shape and size, and

EDWARD W. STEVENS.

Michigan, this 

